If you are looking for a reliable Crypto Portfolio
Tracker APP, I would like to recommend  
CryptoMarketCap.

I am not a sponsor or affiliate of any
kind, just someone who has been using this app
for quite some time now and have found it to
be very useful. I went through many crypto
potfolio tracker apps before finding Crypto Market
Cap and they all had many bugs and issues.
One of them was called "Blockhero" it was working
ok for a while but started having issues like the
others. In comparison to the many that I have tried
so far CryptoMarketCap has been working the best and
as a result, I recommend it to anyone who would
like to track their crypto holdings using their smartphones.
Price updates are the fastest out of all the other apps that
I've used so far and price alerts are also very effective and
reliable. I also like the convenient layout of the platform
which makes it very easy to use by just about anyone.
I especially love the dark theme, it gives the user
a rather sophisticated experience.

If you want to give it a try you can find it on Playstore.
just type the name "crytomarketcap" and you will see
a picture of the app just like the one below.